liminix/modules/wwan/default.nix

{ config, pkgs, lib, ... }:
let
  inherit (pkgs) liminix;
  inherit (lib) mkOption types;
  huawei-cdc-ncm = pkgs.kmodloader.override {
    targets = ["huawei_cdc_ncm"];
    inherit (config.system.outputs) kernel;
  };
in {
  imports = [
    ../service-trigger
    ../mdevd.nix
  ];

  options = {
    system.service.wwan.huawei-e3372 = mkOption {
      type = liminix.lib.types.serviceDefn;
    };
  };
  config = {
    kernel.config = {
      USB_NET_HUAWEI_CDC_NCM = "m";
      USB_USBNET = "y";
      USB_SERIAL = "y";
      USB_SERIAL_OPTION = "y";
    };
    programs.busybox.applets = [
      "insmod" "rmmod"
    ];

    # https://www.0xf8.org/2017/01/flashing-a-huawei-e3372h-4g-lte-stick-from-hilink-to-stick-mode/
    system.service.wwan.huawei-e3372 =
      let svc = config.system.callService ./huawei-e3372.nix {
            apn = mkOption { type = types.str; };
            username = mkOption { type = types.str; };
            password = mkOption { type = types.str; };
            authType = mkOption { type = types.enum [ "pap" "chap" ]; };
          };
      in
        svc // {
          build = args :
            let args' = args // {
                  dependencies = (args.dependencies or []) ++
                                 [huawei-cdc-ncm];
                };
            in svc.build args' ;
        };
  };
}